Paul in Saudi
Emperor
They don't collect "all" internet traffic and the site you linked (in the post you linked to) isn't real.
Seriously, collecting "all" internet traffic means they're storing millions and millions of copies of every episode of Breaking Bad that anyone has ever streamed on Netflix.
Nevermind that the majority of the internet traffic never passes through US servers.
Edit: Also, back of hand math shows that simply the number of hard drives to store 5 zetabytes would be more than the entire US intelligence budget, and to store the actual amount of yearly internet traffic (~30 PB) would take between 25-50% of the world's entire supply of enterprise hard drives.
Consider (again VERONA) in the 1940s, the US and its allied recorded and stored tens of thousands of Soviet messages that were not ever theoretically breakable. (Reel-to-rell tape? Wire recorders? Paper?) They kept it "just in case." (And for traffic, technical and meta-data.)
In the modern era, Google (for example) keeps every search request. (They have to, if only for marketing.) While each copy of Breaking Bad may not be uniquely copied, certainly each request for it, each payment for it, each pirate copy sent is noted and recorded. And even if I am wrong, and each item cannot be saved, we can see that is what they want to do.
The NSA has technical abilities five or even ten years in advance of the marketplace. Look at the neat toys (very small satellite dishes, various public-key coding technologies and so on) we know they have.
The NSA and its counterparts around the world think it is their jobs to record and save everything. Even if they are not exactly doing it now, they will be in the future.
Everyone would be wise to assume everything they do online is recorded.
(Add to the mail covers, records of your spending kept by the banks, records of your location kept by mobile phone companies. Now imagine where that will be in ten years.)
I am not trying to panic-monger about this. It is a natural outgrowth of technology. It will have good and not-so-good aspects. But we ought to realize what is happening.